There are ways to figure that out based on average infection chains and risk, and I've done this for flu. But you couldn't do that now with available informatio

There are ways to figure that out based on average infection chains and risk, and I've done this for flu. But you couldn't do that now with available information. The value you'd get is highly dependent on the R_naught (which you can get a reasonable guess of right now) and the percentage of the population which ultimately gets infected. (Which is a much more uncertain value.)